Arm chair



FIG. 1 is a right side elevational view of an arm chair showing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a left side elevational view;

FIG. 5 is a front elevational view;

FIG. 6 is a bottom plan view; and,

FIG. 7 is a right-front perspective view thereof. 

The ornamental design for an arm chair, as shown. 